Ranked by evidence
Best supplements for seasonal allergies
Nothing in the catalog has better than limited evidence for seasonal allergies, so this list is short and every pick comes with a caveat. Items are ranked by the quality of their allergy trials, not by popularity. The best there is amounts to small, strain- or extract-specific trials that have not been replicated.
Picks are ranked by the strength of published evidence for this goal in otherwise healthy adults. A persistent symptom needs a clinician's evaluation, and no supplement on this list replaces treatment.
Evidence last reviewed: September 2026
Situational
| Option | Evidence | Best for | The honest note | |
|---|---|---|---|---|
| Lactobacillus Paracasei | Limited evidence | trying a strain-specific probiotic | Two small trials of specific strains, GM-080 in children and heat-killed KW3110 in Japanese adults, reported fewer rhinitis symptoms. Limited, industry-sponsored evidence, and the strain code on the label matters. | View |
| Perilla Leaf Extract | Limited evidence | eye and nose symptoms | One placebo-controlled study in 29 people found a rosmarinic-acid-enriched extract reduced eye and nose symptoms over about three weeks. It has never been replicated as a single ingredient, so the evidence is limited. | View |
Popular for this goal — but the evidence says skip
- Butterbur Moderate evidence
Small trials, largely funded by one manufacturer, suggest relief similar to cetirizine, but unpurified butterbur is hepatotoxic and even PA-free products have been linked to liver injury.
- Quercetin Moderate evidence
It blocks histamine release in the test tube, but human allergy trials are few, small and mostly of combination products.
- Stinging Nettle Limited evidence
The allergy claim rests on a single 1990 trial of 98 people that found benefit on global assessment only and has not been replicated in 35 years.
- Bee Pollen Limited evidence
No trial supports eating local pollen to desensitise hay fever, bee-collected pollen is not the wind-borne kind that causes it, and it can trigger anaphylaxis.
- Allergy Support Formulas Limited evidence
Quercetin, nettle and bromelain each rest on thin, small trials, and the blends themselves have essentially never been tested as sold.
- MSM (Methylsulfonylmethane) Limited evidence
The seasonal allergy claim traces to one uncontrolled open-label study with no placebo arm.
Our verdict
If you want to try something, a studied L. paracasei strain or a rosmarinic-acid perilla extract is the least weak option, but neither is proven and neither replaces antihistamines in significant allergy. Skip bee pollen, which can provoke reactions in sensitised people, and butterbur, whose liver risk outweighs a thin allergy record.